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Recent documents in ARROW@TU Dublinen-usSat, 06 Jun 2020 02:30:52 PDT3600Comparison of Grid Array and Microstrip Patch Array Antennas at 28 GHzhttps://arrow.tudublin.ie/engscheleart/313
https://arrow.tudublin.ie/engscheleart/313Fri, 05 Jun 2020 02:13:06 PDT
A millimeter wave Grid Array Antenna for fifth generation (5G) communications is presented. The 20 cell, nearly-rhombic, 40×40 mm2 Grid Array Antenna structure is simulated and fabricated on a Rogers RT/Duroid 5880 substrate with thickness of 0.25 mm. The grid array has |S11|
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Zeeshan Ahmed et al.Enzymes in Synthesis of Novel Functional Food Ingredientshttps://arrow.tudublin.ie/schfsehbk/7
https://arrow.tudublin.ie/schfsehbk/7Fri, 05 Jun 2020 01:45:10 PDTAmit Jaiswal et al.Femagogical Strategies in the Art School: Navigating the Institutionhttps://arrow.tudublin.ie/aaschadpart/48
https://arrow.tudublin.ie/aaschadpart/48Thu, 04 Jun 2020 05:55:34 PDT
This writing aims to define and examine ‘femagogy’ and the transformative potential for an inclusive intersectional feminist teaching practice in Fine Art education in the context of the contemporary Irish art school. This writing will trace the influence of linguistic power structures and the influence of broader institutional patriarchy in an educational setting and outline the inspirations and genealogies of femagogy. This writing provides situated embodied examples of femagogy in practice. It proposes the femagogical model of teaching as one that situates itself outside prevailing patriarchal models and proposes strategies to reimagine knowledge production and navigate the prevailing structural patriarchy in the academic systems of the contemporary art school.
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Barbara Knezevic et al.Erratum: Antidiabetic Activities of an LC/MS Fingerprinted Aqueous Extract of Fagonia Cretica L. In Preclinical Modelshttps://arrow.tudublin.ie/schfsehart/360
https://arrow.tudublin.ie/schfsehart/360Thu, 04 Jun 2020 00:59:21 PDT
Diabetes mellitus is a chronic disease and one of the most important public health challenges facing mankind. Fagonia cretica is a medicinal plant used widely in the Punjab in Pakistan. A recent survey has demonstrated that traditional healers and herbalists frequently use this plant to treat diabetes. In the current study the traditional medicine was prepared as a tea and the profile of the main metabolites present in the TM, was analysed via LC/MS/MS. The extract was shown to contain a number of phenolic glycosides including quercetin-3-O-rutinoside, kaempferol-3-rutnoside, kaempferol-3-O-glycoside, kaempferol-3(6'-malonylglucoside), isorhamnetin-3-O-rutinoside, and isorhamnetin 3-(6''-malonyglucoside) in addtional to two unidenntified sulphonated saponins. The traditional medicine inhibits α-glucosidase in vitro with an IC50 of 4.62 µg/ml. The hypoglycaemic effect of the traditional medicine was evaluated in normoglycaemic and streptozotocin-treated diabetic rats, using glibenclamide as internal control. The preparation (250 or 500 mg/kg body weight) was administered once a Day for 21consecutive Days. The dose of 500 mg/kg was effective in the management of the disease causing a 45% decrease in plasma glucose level at the end of the experimental period. Histological analysis of pancreatic sections confirmed that streptozotocin/nictotinamide treatment caused destruction of pancreatic islet cells while pancreatic sections from treatment groups showed that both the extract and glibenclamide partially prevented this deterioration. The mechanism of this protective effect is unclear. However, such a finding suggests that ingestion of the tea could confer additional benefits and should be investigated further.
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Imran Nazir et al.Magnetic Field Sensor Based on a Tri-microfiber Coupler Ring in Magnetic Fluid and a Fiber Bragg Gratinghttps://arrow.tudublin.ie/arastart/9
https://arrow.tudublin.ie/arastart/9Thu, 04 Jun 2020 00:50:09 PDT
In this paper we propose and investigate a novel magnetic field sensor based on a Tri-microfiber coupler combined with magnetic fluid and a fiber Bragg grating (FBG) in a ring. A sensitivity of 1306 pm/mT was experimentally demonstrated in the range of magnetic fields from 0 to 15 mT. The reflection peak in the output spectrum associated with the FBG serves as a reference point allowing to avoid ambiguity in determining the spectral shift induced by the magnetic field. Due to its high sensitivity at low magnetic fields, the proposed structure could be of high interest in low field biosensing applications that involve a magnetic field, such as magnetic manipulation or separation of biomolecules.
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Fangfang Wei et al.Masculinities and Affective Equality: Love Labour and Care Labour in Men’s Liveshttps://arrow.tudublin.ie/aaschsslcon/15
https://arrow.tudublin.ie/aaschsslcon/15Wed, 03 Jun 2020 09:00:15 PDTNiall G. HanlonFilm & Broadcasting Graduate Showreel 2020https://arrow.tudublin.ie/aaschmrdvid/1
https://arrow.tudublin.ie/aaschmrdvid/1Wed, 03 Jun 2020 07:00:11 PDT
In June every year, the graduate class of Film and Broadcasting at TU Dublin is usually preparing to premiere their final-year work, but as with all aspects of life today in 2020, this year’s cohort of students faced a unique set of challenges.

Covid-19 restricted group activity, so the BA in Film & Broadcasting final-year group had to make entirely solo projects that conformed to government guidelines on social distancing. The result is this showreel of six extraordinary films made during the Covid-19 crisis.

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Suzanne Stapleton et al.An Empirical Evaluation of the Inferential Capacity of Defeasible Argumentation, Non-monotonic Fuzzy Reasoning and Expert Systemshttps://arrow.tudublin.ie/scschcomart/95
https://arrow.tudublin.ie/scschcomart/95Wed, 03 Jun 2020 06:26:09 PDT
Several non-monotonic formalisms exist in the field of Artificial Intelligence for reasoning under uncertainty. Many of these are deductive and knowledge-driven, and also employ procedural and semi-declarative techniques for inferential purposes. Nonetheless, limited work exist for the comparison across distinct techniques and in particular the examination of their inferential capacity. Thus, this paper focuses on a comparison of three knowledge-driven approaches employed for non-monotonic reasoning, namely expert systems, fuzzy reasoning and defeasible argumentation. A knowledge-representation and reasoning problem has been selected: modelling and assessing mental workload. This is an ill-defined construct, and its formalisation can be seen as a reasoning activity under uncertainty. An experimental work was performed by exploiting three deductive knowledge bases produced with the aid of experts in the field. These were coded into models by employing the selected techniques and were subsequently elicited with data gathered from humans. The inferences produced by these models were in turn analysed according to common metrics of evaluation in the field of mental workload, in specific validity and sensitivity. Findings suggest that the variance of the inferences of expert systems and fuzzy reasoning models was higher, highlighting poor stability. Contrarily, that of argument-based models was lower, showing a superior stability of its inferences across knowledge bases and under different system configurations. The originality of this research lies in the quantification of the impact of defeasible argumentation. It contributes to the field of logic and non-monotonic reasoning by situating defeasible argumentation among similar approaches of non-monotonic reasoning under uncertainty through a novel empirical comparison.
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Lucas Rizzo et al.HaRD: a Heterogeneity-aware Replica Deletion for HDFShttps://arrow.tudublin.ie/scschcomart/94
https://arrow.tudublin.ie/scschcomart/94Tue, 02 Jun 2020 09:51:09 PDT
The Hadoop distributed fle system (HDFS) is responsible for storing very large datasets reliably on clusters of commodity machines. The HDFS takes advantage of replication to serve data requested by clients with high throughput. Data replication is a trade-of between better data availability and higher disk usage. Recent studies propose diferent data replication management frameworks that alter the replication factor of fles dynamically in response to the popularity of the data, keeping more replicas for in-demand data to enhance the overall performance of the system. When data gets less popular, these schemes reduce the replication factor, which changes the data distribution and leads to unbalanced data distribution. Such an unbalanced data distribution causes hot spots, low data locality and excessive network usage in the cluster. In this work, we frst confrm that reducing the replication factor causes unbalanced data distribution when using Hadoop’s default replica deletion scheme. Then, we show that even keeping a balanced data distribution using WBRD (data-distribution-aware replica deletion scheme) that we proposed in previous work performs sub-optimally on heterogeneous clusters. In order to overcome this issue, we propose a heterogeneityaware replica deletion scheme (HaRD). HaRD considers the nodes’ processing capabilities when deleting replicas; hence it stores more replicas on the more powerful nodes. We implemented HaRD on top of HDFS and conducted a performance evaluation on a 23-node dedicated heterogeneous cluster. Our results show that HaRD reduced execution time by up to 60%, and 17% when compared to Hadoop and WBRD, respectively
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Hilmi Egemen Ciritoglu et al.Digital Image Exchange using a No-key(s) Protocol with Phase-only Encryption,https://arrow.tudublin.ie/engscheleart/312
https://arrow.tudublin.ie/engscheleart/312Tue, 02 Jun 2020 07:49:52 PDT
This paper considers an algorithm for transferring a digital image over an open network using a No-key(s) Protocol or Three-Way Pass and phase-only encryption/decryption. After providing a short study on the theoretical background to the method, an algorithm is presented on a step-by-step basis. Cryptanalysis is undertaken for the three intercept and single intercept cases, when it is assumed that the encrypted data is intercepted in its entirety for each pass or for any single pass, respectively. The algorithm focuses on the exchange of a JPEG image although in principle, the approach is independent of the format of the image ﬁle that is used. Prototype MATLAB functions are provided for the validation of the approach and for further development by interested readers.
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Jonathan Blackledge et al.A Statistically Signiﬁcant Test to Evaluate the Order or Disorder for a Binary String of a Finite Lengthhttps://arrow.tudublin.ie/engscheleart/311
https://arrow.tudublin.ie/engscheleart/311Tue, 02 Jun 2020 07:42:07 PDT
—This paper addresses a basic problem in regard to the analysis of a ﬁnite binary string or bit stream (of compact support), namely, how to tell whether the string is representative of non-random or intelligible information (involving some form of periodicity, for example), whether it is the product of an entirely random process or whether it is something in between thetwo.Thisproblemhasapplicationsthatincludecryptanalysis, quantitative ﬁnance, machine learning, artiﬁcial intelligence and other forms of signal and image processing involving the general problem of how to distinguishing real noise from information embedded in noise, for example. After providing a short introductiontotheproblem,wefocusontheapplicationofinformation entropy for solving the problem given that this fundamental metric is an intrinsic measure on information in regard to some measurable system. A brief overview on the concept of entropy is given followed by examples of how algorithms can be design to compute the binary entropy of a ﬁnite binary string including important variations on a theme such as the BiEntropy. The problem with computing a single metric of this type is that it can berepresentativeofsimilarbinarystringsandlacksrobustnessin terms of its statistically signiﬁcance. For this reasons, the paper presents a solution to the problem that is based on the KullbackLeibler Divergence (or Relative Entropy) which yields a measure of how one probability distribution is different from another reference probability distribution. By repeatedly computing this metric for different reference (simulated or otherwise) random ﬁnite binary strings, it is shown how the distribution of the resultingsignalchangesforintelligibleandrandombinarystrings of a ﬁnite extent. This allows a number of standard statistical metricstobecomputedfromwhichthefoundationsforamachine learningsystemcanbedeveloped.Alimitednumberofresultsare present for different natural languages to illustrate the approach, a prototype MATLAB function being provide for interested readers to reproduce the results given as required, investigate different data sets and further develop the method considered
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Jonathan Blackledge et al.On the Chirp Function, the Chirplet Transform and the Optimal Communication of Informationhttps://arrow.tudublin.ie/engscheleart2/218
https://arrow.tudublin.ie/engscheleart2/218Tue, 02 Jun 2020 07:11:27 PDT
—The purpose of this extended paper is to provide a review of the chirp function and the chirplet transform and to investigate the application of chirplet modulation for digital communications, in particular, the transmission of binary strings. The signiﬁcance of the chirp function in the solution to a range of fundamental problems in physics is revisited to provide a background to the case and to present the context in which the chirp function plays a central role, the material presented being designed to show a variety of problems with solutions and applications that are characterized by a chirp function in a fundamental way. A study is then provided whose aim is to investigate the uniqueness of the chirp function in regard to its use for convolutionalcodinganddecoding,thelattercase(i.e.decoding) being related to the autocorrelation of the chirp function which provides a unique solution to the deconvolution problem. Complementary material in regard to the uniqueness of a chirp is addressed through an investigation into the selfcharacterizationofthechirpfunctionuponFouriertransformation. This includes a short study on the eigenfunctions of the Fourier transform, leading to a uniqueness conjecture which is based on an application of the Bluestein decomposition of a Fourier transform. The conjecture states that the chirp function is the only phase-only function to have a self-characteristic Fourier transform, and, for a speciﬁc scaling constant, a conjugate eigenfunction. In the context of this conjecture, we consider the transmission of information through a channel characterized by additive noise and the detection of signals with very low Signal-to-Noise Ratios. It is shown that application of chirplet modulation can provide a simple and optimal solution to the problem of transmitting binary strings through noisy communication channels, a result which suggests that all digital communication systems should ideally by predicated on the application of chirplet modulation. In the latter part of the paper, a method is proposed for securing the communication of information (in the form of a binary string) through chirplet modulation that is based on prime number factorization of the chirplet (angular) bandwidth. Coupled with a quantum computer for factorizing very large prime numbers using Shor’s algorithm, the method has the potential for designing a communications protocol speciﬁcally for users with access to quantum computing when the factorization of very large prime numbers is required. In thisrespect,and,intheﬁnalpartofthepaper,weinvestigatethe application of chirplet modulation for communicating through the ‘Water-Hole’. This includes the introduction of a method for distinguishing between genuine ‘intelligible’ binary strings through the Kullback-Leibler divergence which is shown to be statistically signiﬁcant for a number of natural languages.
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Jonathan BlackledgeA Preliminary Study of a Graphene Fractal Sierpinski Antennahttps://arrow.tudublin.ie/engscheleart/310
https://arrow.tudublin.ie/engscheleart/310Tue, 02 Jun 2020 06:55:56 PDT
We provide a preliminary study of a Graphene fractal antenna operating at THz frequencies with the opportunity to modulate the emission. There are a number of advantages of the fractal design, namely multiband/wideband ability, and, a smaller, lighter and simpler configuration for higher gain, that can benefit from the coupling with Graphene, the thinnest and strongest of materials exhibiting very high electrical conductivity and tunability. This paper proposes a conceptual background for the study and presents some preliminary results on the electromagnetic emission simulations undertaken
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Alberto Boretti et al.From the Laboratory to The Vineyard—Evolution of The Measurement of Grape Composition using NIR Spectroscopy towards High-Throughput Analysishttps://arrow.tudublin.ie/scschcpsart/96
https://arrow.tudublin.ie/scschcpsart/96Tue, 02 Jun 2020 05:01:45 PDT
Compared to traditional laboratory methods, spectroscopic techniques (e.g., near infrared, hyperspectralimaging)provideanalystswithaninnovativeandimprovedunderstandingofcomplex issuesbydeterminingseveralchemicalcompoundsandmetabolitesatonce,allowingforthecollection of the sample “ﬁngerprint”. These techniques have the potential to deliver high-throughput options for the analysis of the chemical composition of grapes in the laboratory, the vineyard and before or during harvest, to provide better insights of the chemistry, nutrition and physiology of grapes. Faster computers, the development of software and portable easy to use spectrophotometers and data analytical methods allow for the development of innovative applications of these techniques for the analyses of grape composition.
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Aoife Power et al.An Exploratory Study of ExtremeSport Athletes’ Nature Interactions:From Well-Being to Pro-environmental Behaviorhttps://arrow.tudublin.ie/schfsehart/359
https://arrow.tudublin.ie/schfsehart/359Tue, 02 Jun 2020 04:36:11 PDT
Traditionally, perceptions about extreme sport athletes being disconnected fromnature and a risk-taking population have permeated the research literature. Drawingupon theoretical perspectives from environmental, sport, organizational and positivepsychology, this qualitative study attempts to explore the lived experiences of fourmale and four female extreme sport athletes. The purpose of this study was togain insight and understanding into the individuals’ attitudes toward the benefits ofextreme sport activities for well-being, resilience and pro-environmental behavior. Eightparticipants (Mean age = 40.5 years;SD=±12.9) provided written informed consentto partake in semi-structured interviews. Each athlete provided written consented toallow the publication of their identifiable data and in order to facilitate sharing of theirautobiographical account of their experiences. After conducting thematic analysis,meta-themes that emerged from the analyses were as follows: (a) early childhoodexperiences, (b) the challenge of the outdoors, (c) their emotional response to nature,(d) nature for coping, (e) restorative spaces, and (f) environmental concern. The findingsconvey great commonalities across the participants with regard to their mindset,their emotional well-being as well as their connectivity with nature and attitudestoward the natural environment.
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Tadhg Eoghan MacIntyre et al.Evaluating Food Safety Knowledge and Practices among Foodservice Staff in Al Madinah Hospitals, Saudi Arabiahttps://arrow.tudublin.ie/schfsehart/358
https://arrow.tudublin.ie/schfsehart/358Tue, 02 Jun 2020 03:47:24 PDT
This study examines food safety knowledge and practices of food service staff in Al Madinah hospitals, Saudi Arabia. A total of 163 food service staff participated voluntarily from 10 hospitals across the city of Al Madinah. The participants completed a questionnaire composed of threeparts: Generalcharacteristics,foodsafetyknowledge,andfoodsafetypractices. Resultsshowed that respondents generally had good food safety knowledge with the highest pass rate of 77.9% for knowledge of cross contamination followed by 52.8% for knowledge of food poisoning, and 49.7% of knowledge of food storage. Food safety practices were also strongly observed in the hospitals with a pass rate of 92.6%. Food safety knowledge among the hospital food service staff varied with the level of education, age, and having received food hygiene/safety practices, training while food safety practices had a signiﬁcant association with the level of education and food hygiene/safety practices training of the staff. Spearman rho coefﬁcient results showed that there was a signiﬁcant linear relationship between food safety practice and food safety knowledge, and that food safety knowledge signiﬁcantly predicts food safety practices. This research revealed the importance of education and consistent training of food service staff in improving knowledge and thereby better and safe food handling practices, which could contribute to apply food safety in the hospitals
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Anushree Priyadarshini et al.